Octopus Energy has unveiled a new cooling system that could turn its existing Cosy heat pumps into home air conditioners, without the hefty cost of installing a separate air-con unit.
Called the Cosy Cooler, the British-engineered add-on will cost between £500 and £600 when it launches in 2027, significantly less than the £2,000 to £6,000 typically charged for traditional air-conditioning installations. It’s designed specifically for homes already using Octopus’ Cosy heat pump system, with installation expected to take around three hours and no major building work required.
Rather than needing a separate outdoor unit or exhaust hose, the Cosy Cooler connects directly to existing radiator pipework. The outdoor heat pump works in reverse to chill water, which is then circulated through the home’s central heating pipes. The indoor unit draws in warm air, passes it over a built-in heat exchanger and circulates cooler air back into the room.
The portable unit is roughly the size of a tall kitchen bin, measuring 72.2cm tall, 43cm wide and 35.8cm deep, with a prototype weight of around 28kg. It can cool individual rooms, while compatible Cosy heat pump systems can support two or three units running simultaneously, depending on the model.
The announcement comes after another unusually hot British summer, with temperatures reaching 38.2°C in August 2026. With warmer summers becoming an increasing concern, Octopus is looking to make its heat pump technology useful beyond the colder months, offering homeowners both heating and cooling from the same system.
It’s also part of the company’s wider push to make heat pumps a more affordable alternative to gas boilers. Octopus claims 99% of its Cosy customers pay less to run their heat pumps than they would a gas boiler, saving an average of £230 annually. The company has also received 570,000 heat pump enquiries over the past 18 months, suggesting interest in the technology is growing.
The Cosy Cooler isn’t available to buy just yet, but live trials in homes and offices are already underway, with Octopus looking for additional testers ahead of its planned 2027 launch.
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